55615560066 has 64 divisors (see below), whose sum is σ = 135137600640. Its totient is φ = 16814200320.

The previous prime is 55615560047. The next prime is 55615560071. The reversal of 55615560066 is 66006551655.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149086 + ... + 365318.

It is an arithmetic number, because the mean of its divisors is an integer number (2111525010).

Almost surely, 2^55615560066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55615560066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67568800320).

55615560066 is an abundant number, since it is smaller than the sum of its proper divisors (79522040574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55615560066 is a wasteful number, since it uses less digits than its factorization.

55615560066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216688 (or 216682 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 55615560066 in words is "fifty-five billion, six hundred fifteen million, five hundred sixty thousand, sixty-six".